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Mean number of substitutions, from the base of U6, for the three subgroups of U6 calculated for the twelve complete sequences.
| REGIONS | ||||||
| N | Total | Coding | HVSI | Coding/HVSI | Syn./nonsyn. | |
| U6b | 4 | 6.3 | 3.3 | 3.0 | 1.1 | 0.8 |
| U6a | 6 | 12.8 | 8.5 | 4.3 | 2.0 | 2.3 |
| U6c | 2 | 12.5 | 6.5 | 6.0 | 1.1 | 1.0 |
